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life 102 exam 2 study guide Chapter 6: Energy & Metabolism
Terms in this set (26)
What is the First Law of Thermodynamics?
Energy cannot be created or destroyed
What is anabolism
What is Catabolism
the breakdown of complex molecules in living organisms to form simpler ones, together with the release of energy; destructive metabolism.
how is anabolism and catabolism related?
What is Gibbs free energy?
The energy associated with a chemical reaction that can be used to do work
What is the relationship between the ΔG for a chemical reaction and an exergonic or endergonic reaction?
What is an exergonic reaction
A chemical reaction that releases energy
What is an endergonic reaction?
reaction that requires energy
What are the components of ATP?
adenine, ribose, 3 phosphate groups
How is ATP used to perform some types of cellular work?
How does the energy in ATP facilitate chemical reactions?
What is activation energy?
energy needed to start a chemical reaction
What are the mechanisms used to overcome activation energy?
What is an enzyme?
a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction.
What is the active site?
The active site is the region on the enzyme where the substrate binds.
What effect does an enzyme have on the activation energy needed for a chemical reaction?
What affects enzyme activity?
temperature and pH
What happens to an enzyme during the course of a chemical reaction?
Are enzymes permanently altered in a chemical reaction?
What is a co-factor?
An inorganic ion or nonprotein organic molecule at the active site that makes the enzyme active
what is a coenzyme?
a nonprotein compound that is necessary for the functioning of an enzyme.
what is a competitive inhibitor?
a molecule that competes with the substrate to bind in the active site of an enzyme.
what is a non-competitive inhibitor?
An inhibitor which works by binding to the enzyme at a site away from the active site which causes the active site to change shape.
what is a allosteric site?
Another site on the enzyme where an inhibitor can bind.
What is feed-back inhibition
when a product in a pathway goes back and tells one of the previous enzymes to stop
What is the effect of an increase in product in a multi-enzyme pathway?
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